I'm going to start putting together edubuntu machines with donated hardware and give them to schools. Anyone with me?

I'm making a T1 test bed system for my company and I need to know if anyone knows the pinout for connecting two Larscom AccessT-100 CSU/DSUs together. I want two of them to be connected to together via null modem to simulate a T1 connection. We're using this for testing of routers and switches as well as pre-config for said devices before we put them in full op. I trust that some fellow /.er out there has played with these before. I looked through the old manuals that we have and even googled the heck out of it to no avail.